Fly cutter



y 1945- I R. o. JULIAN 2,375,926

FLY CUTTER Filed Feb. 23, 1944 INVENT OR.

BY RICHARD OJULIAN Patented May 15, 1945 UNl'lED STATES PATENT OF FlCE FLY CUTTER Richard .0. Julian, Richmond, .Ind.

Application February 23, 1944, Serial No. 5233775 (Cl. 29- 9v-) 3 Claims.

to provide a fly cutter that is sturdy and durable, a

easy to apply to use, and which will afford facility for the placing and adjusting of the cutter bits;

and which said device in its entirety, will effec- I tively withstand forces tendingto deflect it from true form or to strain the cutter bits from their truly aligned positions.

The above named general object, as well as other and more specific aims, and which have to do with improvements in structure, detail, and arrangement of the several parts, looking to economy of manufacture, ease of handling, facility of disposing the cutter bits for meeting various conditions, and dependability; are accomplished by, and my invention is contained in the typical embodiment thereof illustrated in the accompanying drawing and described in the following specification.

The several parts of the invention as they appear in the different views in the drawing are identified by suitable characters of reference applied to them.

In the drawing:

Figure 1 is a side View of my improved fly cutter.

Figure 2 is a top plan view, taken in the direction of arrow 2 in Figure 1.

Figure 3 is an end view taken in the direction of arrow 3 in Figure 1.

Figure 4 is a vertical cross section View taken on the broken line d4 in the direction of arrow 4 in Figure 1.

Figure 5 is a vertical cross section View taken on the broken line 55, in the direction of arrow 5 in Figure 1.

Figure 6 is a modification.

Figure '7 is a modification.

Figure 8 is an end view in the direction of arrow 8 in Figure 7.

Whereas in the present description, my invention is referred to as being used in connection with a milling machine of the bed type and wherein the arbor or spindle is adjustable vertically; it will be understood that the invention is adaptable to machines of other types and wherein the spindle of such machine is not necessarily vertical.

Body H] which may be made of cold rolled steel or other suitable metal and is of block shaped elongated formation and of the suitable proportions as indicated by the drawing, is provided with vertical bore H and keyway I2 whereby said body is capable of being securely fastened, as by key 13, to the arbor or spindle A of the milling machine (not shown).

Closely adjacent to, and equally spaced from each side of said vertical bore II, is a horizontal cylindrical cross bore l6 which is segmented at a point relatively. near its wall so as to provide lateral flat face I! which is parallel with the main axis of said cross bore l6. By a central cleft l8 which extends from each end of said body I 0 into the cross bore 16 thereat, each of the end portions of said body is divided, the opposed sides ['9 and '20 thereof being indicated in Figure 4.

.Socket head clamp screws 22 passed through holes therefor in the side 19 and threaded in the consists of a section of drill rod or other suitable material of desired length, and which is segmented at a point a predetermined distance from and in parallelism with the longitudinal axis of the beam, such segmentation providing a flat or plane face 2'! which corresponds with the flat face r I! of each of the cross bores 16 of said body [0.

The cross section formation of the beam is identical with cross section formation of the cross bore 16, with sufiicient difference to permit'the beams to be received snugly in said cross bores. In each of the said cross bores of said body l0, and in directions opposed, one to the other, an end portion of each beam is disposed, the face 27 of the beam being in registration and metal to metal agement with the face 11 of the said cross bore, and the said beams thereby projecting from the body H] in opposite directions, as indicated in the top plan view Figure 2.

Upon screwing home the socket head screws 22, the sides of the said body member 10 are drawn toward each other and the beams are securely gripped and are fixedly secured in united relation with the body member; the peripheral surf-ace and the lateral face 2'! of each of the beams being tenaciously coengaged with the wall surface and the lateral face I! of each of the said cross bores [6.

A clamp block carried by each of said beams at its outboard portion, is rectangular in formation, and is provided with a cross bore 32 in which the beam is received. By a central cleft 33 which extends from an end of said block into the said cross bore 32, the end portion of said block is divided, as indicated in Figure 5. Socket head clamp screw 36 passed through a hole therefor in side 34, and threaded in the other side of said block, constitutes a means operable manually whereby the sides of said block may be drawn toward each other and there held. Provided at the other end portion of said clamp block is a vertical aperture 38 which is so located with relation to the cross bore 32, that the plane of the outer wall 39 of the said aperture is parallel with the face 21 of the beam, as shown in Figure 5.

In adjusting my improved tool device, each of the clamp blocks is set with its cutter bar 40 at approximately the position desired. The clamp screw 36 is tightened sumciently to permit of positioning the cutter bar precisely. When the adjustment of the cutter bar will have been made, the said screw 36 is driven home, the sides of the block thereby being drawn into metal to metal engagement with the cutter bar, and the cutter bar with the face of the beam, whereby the beam, clamp block, and cutter bar are tenaciously securedin their mutually related positions.

The several parts combined and arranged as shown, constitute a tool device which is unyielding in form, and is possessed of strength and dependability necessary to carry the cutter bars accurately and with such precision and firmness that liability of vibration during operation, is eliminated.

Installation of my improved tool device consists simply in applying the body member ID to the machine spindle, inserting the cutter bars in the clamp blocks, and then adjusting the clamp block to and securing it at the desired point on the beam, such point being dictated of course by the particular job to be worked on.

By reason of the dependable retention of the cutter bars, and by reason of the unyielding character of the beam and its connections, wear at the cutting edges of said bars is reduced to a minimum. Necessity of re-sharpening, and of renewals are rendered less frequent, and the cutting by the bars is uniform and extremely accurate. Adjusting the device for various widths of cut involves simply the changing of the distance of the clamp block from the axis of the machine spindle. This adjustment may require either the positioning of the clamp block on the beam or, and also the adjustment of the position of the beam in the body ill by manipulation of the screws 22.

My invention is applicable of course to machine arbors or spindles of various types, and is adaptable for work of different kinds and wherein special poising of the cutter bars is desirable.

For example, in the modification at Figure 6, the cross bore 42 of the clamp block is directed at an oblique angle, enabling the cutter bar to be held accordingly at a changed angle of incline.

In the modification illustrated in Figure 7 and Figure 8, the cutter bar receiving aperture 48 is at a right angle to the axis of the clamp block, and whereby the cutter bar is retained in alignment parallel with the longitudinal axis of the beam. This modified form of clamp block is especially desirable for use wherein boring operations are performed.

It will be understood that the invention is capable of modifications and alterations in many respects that might occur to a person skilled in the art to which this invention appertains, without departing from the principles of my invention.

What I claim as my invention, is:

1. A tool device of the kind described, comprising an elongated body having a central bore in which the machine arbor is received and secured, there being a cylindrical cross bore through said body at a point adjacent to each of the opposite sides of, and at a right angle to said central bore, each of said cross bores being segmented at a point relatively near its wall and in parallelism with its main axis and providing a lateral flat face, and there being in each end of said body a central cleft parallel with and opening into the crossbore thereat, similar support beams, each being cylindrical in cross section and segmented at a. point relatively near its periphery and in parallelism with its main axis and providing a fiat lateral face to correspond with the lateral fiat face of the crossbore of said body, an end portion of each beam being received in one of the cross bores of that body, the direction in which one beam projects being opposed to the direction in which the other projects from said body, clamp screws interconnecting the opposed sides of each end portion of said body and which are manually operable to draw the sides of said body toward each other and to hold the beams and said body in securely united relation, a clamp block carried by each of the beams, each of said clamp blocks having a bore therethrough and in which the outboard portion of the beam is received, one end of said block having a central cleft that is parallel with and extends into the said bore thereby dividing the end portion of said block, and there being an aperture through the other end of said block and at an angle to the said cross bore, the side of said aperture that faces toward the beam being in line with the face of said beam, a cutter bit retained in said aperture, and a clamp screw interconnecting the opposite sides of the end portion of said block and manually operable to draw the sides of said block toward each other and to hold the beam, cutter bar, and block in mutually secured united relation.

2. A tool device of the kind described, comprising a body provided with a main bore adapted to receive and to have secured therein a machine spindle, said body having a cylindrical crossbore which is offset at a right angle from and is at an angle to the main axis of said main bore, the said crossbore being segmented at a point relatively near its wall, the segmentation thereof constituting a straight wall face that is parallel with the axis of said crossbore, a beam cylindrical in cross section and segmented at a point distant from its axis to constitute a straight wall face parallel to said axis and to correspond with the straight wall face of said crossbore, and an end portion of said beam being retained in said crossbore, means to fixedly secure the beam in united relation with said body, a'clamp block provided with a crossbore in which the outboard portion of the said beam is received, an end of said block having a central cleft opening into said crossbore, there being at the other end of said block an aperture at a right angle to the axis of said beam, a cutter bar retained in said aperture, one side of said cutter bar resting against the outboard wall of said aperture and the other against the flat face of the beam, and means to draw the opposed sides of the divided portion of the block toward each other and to secure them in indrawn status whereby the block, cutter bar and beam are mutually held insecurely united relation.

3. A tool holder device for fly cutting, consisting of a beam cylindrical in cross section and having a segmentary straight fiat face that is parallel with the axis of said beam, and. which said beam is adapted to be secured to the spindle of the machine, a clamp block provided with a cylindrical crossbore and Within which said crossbore the said beam is received, an end portion of said block having a cleft communicating with said crossbore, there being at the other end portion of said block an aperture therethrough at an angle to the axis of and communicating with said crossbore, a cutter bar in said aperture and being in registration with the flat face of said beam, and a c1amp screw interconnecting the opposite sides of the block at said cleft, and which is operable to draw the sides of the block toward each other and to hold them whereby the beam, cutter bar and block, are held fixedly in mutually united relation.

RICHARD O. JULIAN. 

